Tolong dibantu jawab yaano 18.. thx

Jawab :

(BC)² = (AB)² - (AC)²
          = 10² - 8²
          = 100 - 64
(BC)² = 36
BC = 6 cm

Perbandingan :
AO/AB = OD/BC
5/10 = OD/6
10 OD = 30
     OD = 30/10
     OD = 3 cm


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